# What is the Quantity of Water that Must be Added to Make the Ratio 7:6? If

The ratio of milk and water in a 55 kg mixture is 7:4. What is the quantity of water that must be added to make the ratio 7:6?

- 15 kg
- 10 kg
- 5 kg
- 12 kg

**Answer: (2) 10 kg.
Explanation:-
**Let be the quantity of milk in a mixture = 7X and quantity of water in a mixture = 4X

Mixture = 55 kg. (Given)

7X + 4X = 55

11X = 55

X = 5

Then, quantity of milk in a mixture = 7 x 5 = 35 km and water = 5 x 4 = 20 kg.

Let be the Y litres of water must be added to make the ratio = 7:6

Then, 35/ (20 + X) = 7/6

210 = 140 + 7X

7X = 70

X = 10

Hence, the answer is (2) 10 kg.